Transmission



March 22 1932. o, F. mcH 1,850,834

TRANSMI SS ION Filed Jan, 10, 1929 Y s Sheets-Sheet 1 INVENTOR. ORA Z1 7'77Yc/1 BM /WM A TTORN E Y.

March 22, 1932. o, F, FINCH 1,850,834

TRANSMISSION Filed Jan. 10, 1929- s Sheets-Sheet z INVENTOR. OIFA E FINcH ATTORNEY.

0. F. FINCH TRANSMISSION March 22, 1932.

Filed Jam: 10, 1929 5 Sheets-Sheet 3 H mm W M m/ ATTORNEY.

Paltented Mar. 2 2,111 932 i {PATENT mm 1 aouarrmnmonr.r'rnomorzronnno, 'orrro, Assrenon 'ro rnn'wrLL'rs-ovnnmnncom- I I 1mm; or roLnDo, onro, A 'oortronh'rrou or OHIO I r rn-ANsmssIo-n Application" :filedl'mhary 10, 1929. Serial N0. 331;612.

' invention relates t o trans missions such 7 .as .are commonly employed on automobiles,

and it, is particularly. adaptableto transmis-;

.sions ofrthe :so-called four-speed type; .One'ofythe .principal objects not my invention iis'toi'simplify" the gear shift, mechanism by which the :slidable. gearsare maintained in :a locked position.-

. I I r :It is', .a;-further objectwof my invention. to

" provide a gearshift mechanism ofx'reduced number ofip'arts Which may beyassembled awith more compactness than has beenpossible heretofore;

.It is a :furtheraobjeotg'oftheiinventionto as reduce the kcost of transmission'by simplification and .eliminationof parts, {as well :as the reduction inj'laborgcosts f I The invention. j likewise. contemplates a structurewhichiscapableof improved oper- 2 0 zation and which, by reason of fits' si'mplic ty is capable of prolonged uninterrupted serince.

.These objects, togetherwith other objects.

and-radvantages become more apparent from fatconsideration of-the drawings and 2 5 :descriptiomspecifically {related thereto. V

Figure I is a sectional view illustrating an-iembodiment ;of.my invention which may *be preferred. r F'g. II "s an end view "of thestructure illustrated in Figure I.- p

- Fig. @III is I 21 plan -"view, partly in section, of the structure illustrated iii-Figural. Fig. IV is adetailed fragmentary-view,

.. partly in section illustrating therelation of thelocking means when the gear 's'hift lever is movedfout of its neutraliposition. V g

V F i'g.;Vis alfragmentary plan yiew ofthe 'structure shown; in Fig. III embodying a modifie d form of locating means. 7 131g. VI isa sectional View taken along the line VI S VI ;'1n"IB.ig. V.

v VII isa'detailedyiew' of a segment .0: theisupportingfshaft taken substantially "aleng tlreline jIZIIVII 1 Fig. VIII is a .sectional viewtaken along the line VIIIVIII in. Figure I; and,

Fig. IXis agear shift'idiagram ofthetransmission which is illustrated. V v

Whilethe major features of the'invention .are contained in the gear actuating .mecha;

nismjof the transmissiom :the gear structure hasjbeen illustrated to set .forthmore clearlythe] relationship which the inventionbears to the. assorted elements of the transmission. Thus, there 1s provided atransm1ss1on.hous.

inglO wherein there is journaled a mainsha ft" 11 upon which there aremounted a pair of integral 'spur gears 12 and Band a single spurgear lt' prov'ided with .an internally .19 ,.-20 and 21. Laterallypfthe counter shaft:

. an auxiliary shaft'22 is j ournaledin the housing on which an integral pair of gear's'28 and Qttare slidably mounted.

'irra bearing 26 which is mountedin thehous- -ing. The other end thereof is rotatably .mounted in the hollowed end of aystubzshatt Onelend of the mainshaft 1-1 is journaled 2 I i '69' v geared olutchp0rtion.1 5.- Directly below the assembly consisting-of four spur gears, 18,'. 5 565 .28. which is itself rotatably' mounted .inla

"bearing- .29 that is fitted in the housing. A

gear 30 is formed integrally with the hollowed end of the shaftone portionof which is in constant mesh: with gear 21, theother i portion being slidably engagedjby clutch.

Byireferring to Figure I thediagram illustrated in Fig. IX,1il'/Will beapparent that when gear 12 is shifted intoengagement with gear. 18 on thecouritershait, the greatest speed reduction will ,be had; by shifting. the

. gear13 into engagement with itsmating gear 19 the second lowest speed reduction. will 0btain." By sliding gear :14E'intoengagement l with gear 20'lon the countershatt'the device; 7

will operate on its next'highest speed andby shifting-the gear 14: inthenopposite direction whereby the internal clutch will mesh with the gear on the shaft 28, a direct drive is obtained. The reverse direction of drive is realized by shifting the gears 23 and24 mounted on the auxiliary shaft 22, whereby the will interconnect gears 18 and 12.

order to shift the gears in the manner housingin any manner whereby it forms an integral unit therewith. At one end of the bossed portion, according to the modification illustrated in Figs. V to VII, a horizontal tapped opening accommodates a spring 35 which maintains a detent 36 firmly against the shaft and the shaft, in turn, is provided "with a grooved portion to serve as a locating means for the shaft. The cover plate is formed with a raised portion 37 to accommodate a gear shift lever 38 which is universally mounted therein in the conventional manher. 'Thelower extremity of the leverextends downwardlyproximate the shaft 33. A pair of symmetrical forked bossed members 39 and 40are slidably mounted on the shaft. Each is provided with a horizontal arm portion 41 and 42 which extend in the direction of the other forked member and are s aced with respect to' themselves and the shaft 33. The forked portions en age reprovided therefor in the slida le gear units '14 and 12 res ectiv'ely. On'the exposed side of each arm t mm is formed a recess 43 and grooves 44. 1

v ossed forked member 46 is clamped securely to the shaft immediatel above the reears 23' and 24,-the orked portion verse thereo being positioned to engage the gears,

in the conventional manner. .An arm 47 is formed integrally with the bossed portion which extends'horizontally above the shaft and between the arms of the pair of forked members. The arm is provided with a locking groove 48-and a recess 49 which is in cooperative alignment with the recesses formed on the other two arms. An aligned relationship between the arm 47' and arms 41 and 42 is assured by a air of guide members 51 which are formed 34 and extend downwardly to engage the exposed lateral portions of the arm. A air of mating bosses 52 and 53 are likewise ormed integrally with'the cover immediately adj acent the recesses formed in the arm members for aligning arms 41 and 42. Within the bows shoulderedpin members 54 and 55 are 'slidably disposed, which are urged inwardly into engagement with the lever 38 by a coil spring 56 that is maintained in the boss by a (:8. g 7' o operate the device, for example, to shift integrally with the cover,

the gears'into second speed position, the lever 38 is pivoted manually into the position illustrated in Fig. IV whereby the in 55 is urged inwardly by its spring until t e shoulder engages the arm 41 and the extremity of the pin extends into the recess 49 formed in the arm. Simultaneously pin 54 is pressed outwardly by the lever until it esca es the arm 42 after which the lever is shifte in the direction indicated by the arrow until the pin 54 slides into the groove 44. The gear 13 will have thus been moved forwardly until it is in operative engagement with the gear 19 on the shaft 17 It will be noted that under these conditions, the'arms 41 and '47 are positively locked and the gears are, therefore, likewise locked.

' In order to shift the device into reverse opcrating-position from the neutral position as pin 54 engages'the groove48-formed in the arm in a manner similar to the forward drive positions. When the'modified lockin means is employed, which is illustrated in i s. V to VII, the bossed fork is secured firm y to the rod and is secured in reverse position when the detent 36 is forced into engagement with the groove formed therefor in the shaft 33. It.w1ll be-noted that in the embodiment shown in Fig. III boss 46 need not be locked to the shaft 33, although preferably the fork is so constructed. Y

By practicing my invention one is enabled to simplify thegear'shift structure, as well as to reduce the number, of parts that have been employed heretofore. This simplificationand reduction in number of parts affords not only a marked saving in cost of material and labor but improves upon the operation of the device.

' Although I have illustrated but a sin le embodiment it will be apparent that t e invention is susceptible to many embodiments engaging certain of the gears and adapted toactuate the same, andmeans rigidly secured tome slidable support member for engaging other of the gears and adapted to actuate said other of the gears.

2. In a transmission of the class describe having a plurality of-slidablegears anda l bly mounted support member, and a pluraluniversally mounted gear shift lever, a slid.- ably mounted support member, means con trolled bythelever and slidable on the support member for engaging certain of the gears, and means rigidlyfixed to the support member likewise actuated by the lever and adapted to engage and actuate other of the "gears.

3. In a transmission :of the class described having a plurality of slidable gears and a universally mounted gear shift lever, a slidaity-of gear engagingmeans mounted on the support member for actuating individual 1 'slidable gears one ofsaid gear engaging means of independently operated gear engaging means mounted on the support member for actuating individual gears one of the said actuating members being perinanently'fixed to the shaft. s p

5. In a transmission of the class described a combination of a plurality of slidable gears,

an=axially slidable shaft, a pair of actuating members having journaled portions slidably' mounted on the shaft, a third actuating member fixed securely to the slidable shaft, a

' manually operated leve'r engageable with the 8. In a transmission ofth class having a plurality of slidable gears, a univer-' members and, adapted. to actuate the same individually.

6. In a-transmission of the class described a gear operating control comprising'a univere sally mountedlever, a sli'dably mounted shaft,

a. pair of similar gear engaging members horizontal arm portions above said shaft, and a third gearengaging member fixed securely to the shaft having an'integral arm portion disposed between the horizontal arm portions of the otliergear engaging members.

. 7. In a four-speed transmission a gear shift mechanism compr sing a universally mounted lever, a horizontallydisposed axially s'lidable shaft, a, pair of gear-engaging members slidably disposed on the shaft, a

third gear ngaging member rigidly secured to the shaft, and means co-operatively disposed with respect to the members, whereby two of the members, are maintained in, a locked position at all times.

sally mounted gear shift rod, a 'slidably mountedsupport member, a pair of gear ac tuating members slidably mounted on the support member. provided 'with horizontal arms spaced with respect toeach other and having recesses formed therein, a third gear engaging member rigidly secured to the support member and movable therewith having described 1 an ral portion dis osed between thearmiportionsof the pair of gear engaging members, means coeoperatively disposed withre'spec't, v s to the 3 gear shift lever 1 and grooved arms j whereby-two of the arms are at all times maint'ainedina lockedposition.

' 9. In atr'ansmission' of the class described,

including a plurality of 'slidably mounted gears, a gear shift mechanism including a u'ni- I versally mounted shift lever, a shaft member a disposed between the gears and the lever,

a pair of gean lengaging members slida'bly mountedon the support co-operatively' disposed with respect to, thelever and adapted to actuate the gears, horizontal arms'formed integrally with the members spaced'lateral- I 1y of each other, each of-said arms being pro vided with a recess and grooves spaced with respect to the recesses, a third gear engaging member likewise'mounted on the shaft and supported thereby adapted to actuate another gear said third member having an arm" disposed horizontally between the arms of the;

- pair ofmembers saidarm having a recess and a groove spaced with respect to the recess-T,

plungers mounted on the opposite sides of the 'j arms adaptedto lock twoof the arms inposi-ftionby engagingtherecesses and to fix .thef. position of the other arm by engaging the groove formed therein.

10. In atransmission of the class described aigear shift mechanismincludinga slidable" 1 supporting shaft', a pair of gear engaging members inounted thereon, eachof said mem-' bers beingprovided with a groove and recesses spaced with respect to thegroove, a

third member secured to the shaft vhavinga roove ands aced ecesses co-o e t' l d'sslidably disposed on the-shaft each having. P r p m We 1 supportingshaft, a pair of gear engaging members slidably supported on the shaft and iio i ris provided with horizontally spaced arms, said arms being provided with recesses and f l grooves spaced from the recesses, a third gear" engaging member mounted on and movable with the'supporting shaft and having a horizontally disposed arm said arm having a recessandja groove co-operatively disposed with respect 'to the groove formed in the adjacent arm, a gear, shift lever co-operatively disposed with respect to the arms, and resiliently disposed means adapted to engage the recesses in two of the arms at any time and to engage the groove in the third arm.

12.. In a transmission-of theclass described, a gear shiftmechanisin including a movable to formedtherein, a pair of'shouldered locking I supporting shaft; a pluralityof gear engaging'members 'slidably' mounted upon said shaft, another gear en aging member fixed to said shaft and mova le therewith, each of 'said members being formed, with a slot;

means whereby said members may be selectively moved to bring said slotsinto and out of registration; and a plurality of locking means engageable with the slots in said members whereby only one of said members may be positively moved from local position.

Intestimony whereof, I aflix my signature. I ORA F. FINOH. 

